Record Details

How oceanography influences Fishery Biology? - A Case of distribution differences in carnivorous and planktivorous fishes along the Coastal Waters of Eastern Arabian Sea In: ICAR Sponsored Winter School on Recent Advances in Fishery Biology Techniques for Biodiversity Evaluation and Conservation, 1-21 December 2018, Kochi.

CMFRI Repository

View Archive Info
 
 
Field Value
 
Relation http://eprints.cmfri.org.in/13337/
 
Title How oceanography influences Fishery Biology?
- A Case of distribution differences in
carnivorous and planktivorous fishes along the
Coastal Waters of Eastern Arabian Sea In: ICAR Sponsored Winter School on Recent Advances in Fishery Biology Techniques for Biodiversity Evaluation and Conservation, 1-21 December 2018, Kochi.
 
Creator George, Grinson
Jayasankar, J
Shah, Phiros
Joseph, Tharun
Monolisha, S
Shafeeque, Muhammed
Platt, Trevor
Sathyendranath, Shubha
 
Subject Oceanography
Fishery Biology
 
Description Understanding the link between physical oceanographic events and seasonality in catch
composition is a critical component in the accurate assessment of climate change impacts in
context of fisheries. This remains elusive owing to the lack of synoptic-level datasets on the relevant
oceanographic variables. The advent of satellite remote sensing that can measure oceanographic
variables at high spatial and temporal resolution has helped to address this challenge. Prior studies
have communicated the puzzling dominance of carnivores (fish groups) in North East Arabian Sea
(NEAS) whereas planktivores appear to thrive in South East Arabian Sea (SEAS). The study attempts
to address this conundrum by taking cues from the influence of oceanographic forcing upon seasonal
trends in catch composition using remotely-sensed oceanographic variables and mean standardized
catch. The anoxic conditions associated with intense seasonal upwelling in SEAS waters leads to the
reduction in the vertical extent of demersal carnivore habitats. The demersal habitats in NEAS waters
have a higher likelihood of entraining oxygen rich (>0.5 ml/L) water column when compared with
its southern counterpart especially from August to November. Moreover, NEAS waters cater to the
nutritional requirements of juvenile demersal carnivore population as it supports primary production
both during summer and winter monsoon months. The perpetual presence of chlorophyll biomass
allows for the persistence of a prey base that maximizes the likelihood of demersal adult population
being well-fed. The poleward directed West India Coastal Current facilitates the passive drift of
juveniles towards productive and oxygen rich habitats in NEAS waters. For demersal/pelagic
carnivores that undergo recruitment over a long span of time (> 6 months), NEAS waters provide
the best spawning ground capable of meeting their long-term nutritional demands. Pelagic
planktivores thrive in SEAS, where seasonal upwelling supported primary production remains the
norm, owing to their relatively short recruitment span (< 4 months). Unlike SEAS, NEAS waters are
found to provide suitable environment geared towards the successful larval recruitment, sustenance
and survival of the demersal carnivore group. This could act as a forcing function in driving the
annual catch composition of landing data registered in NEAS waters toward carnivore spectrum.
 
Date 2018
 
Type Teaching Resource
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/13337/1/35-Winter%20School%20on%20Recent%20Advances%20in%20Fishery%20Biology%20Techniques%20for%20Biodiversity%20Evaluation%20and%20Conservation_2018_Grinson%20George.pdf
George, Grinson and Jayasankar, J and Shah, Phiros and Joseph, Tharun and Monolisha, S and Shafeeque, Muhammed and Platt, Trevor and Sathyendranath, Shubha (2018) How oceanography influences Fishery Biology? - A Case of distribution differences in carnivorous and planktivorous fishes along the Coastal Waters of Eastern Arabian Sea In: ICAR Sponsored Winter School on Recent Advances in Fishery Biology Techniques for Biodiversity Evaluation and Conservation, 1-21 December 2018, Kochi. [Teaching Resource]